<template>
  <div>
    <el-tag
      :key="tag"
      v-for="tag in dynamicTags"
      closable
      :disable-transitions="false"
      @close="handleClose(tag)"
    >
      {{ tag }}
    </el-tag>
    <el-input
      class="input-new-tag"
      v-if="inputVisible"
      v-model.trim="inputValue"
      ref="saveTagInput"
      size="small"
      @keyup.enter.native="handleInputConfirm"
      @blur="handleInputConfirm"
    >
    </el-input>
    <el-button v-else class="button-new-tag" size="small" @click="showInput"
      >+ New Tag</el-button
    >
  </div>
</template>

<style>
.el-tag + .el-tag {
  margin-left: 10px;
}
.button-new-tag {
  margin-left: 10px;
  height: 32px;
  line-height: 30px;
  padding-top: 0;
  padding-bottom: 0;
}
.input-new-tag {
  width: 90px;
  margin-left: 10px;
  vertical-align: bottom;
}
</style>

<script>
export default {
  name: "UnDTag",
  props: {
    value: {
      type: Array,
      default: () => [],
    },
    updateTags: {
      type: Function,
      default: () => {},
    },
  },
  data() {
    return {
      dynamicTags: this.value || [],
      inputVisible: false,
      inputValue: "",
    };
  },
  watch: {
    dynamicTags: {
      handler(newVal) {
        this.updateTags(newVal);
      },
      immediate: true,
    },
  },
  methods: {
    handleClose(tag) {
      this.dynamicTags.splice(this.dynamicTags.indexOf(tag), 1);
    },

    showInput() {
      this.inputVisible = true;
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },

    handleInputConfirm(e) {
      e.preventDefault();
      e.stopPropagation();
      let inputValue = this.inputValue;
      if (inputValue) {
        // 去重
        if (this.dynamicTags.includes(inputValue)) {
          this.$message.success("标签已存在");
          return;
        }

        this.dynamicTags.push(inputValue);
      }
      this.inputVisible = false;
      this.inputValue = "";
    },
  },
};
</script>
